Vacuum pump



FIG. 1 is a perspective view of a vacuum pump showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 6 with the internal parts omitted thereof.

The broken line portions of the vacuum pump in all views represent unclaimed portions of the claimed design and form no part thereof. 

CLAIM The ornamental design for a vacuum pump, as shown and described. 